Yz450 engine

Quick question i got a 98 yz400f and i found a new 06 yz450f engine for sale would it fit in my frame ?

Quick question i got a 98 yz400f and i found a new 06 yz450f engine for sale would it fit in my frame ?

Some people on here will know for sure, but I'm PRETTY sure it will NOT fit. The engines in the 06 and up were different than 05 and down motors. The 06 Motors will fit in the Aluminum framed yzf's.

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